Printing frame



J. D. THOMPSON.

PRINTING FRAME.

APPHCATION FILED ocr. 17. 1918.

Patented July 4, 1922.

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WITNESSES J. D. THOMPSON. PRINTING FRAME.

APPHCATION FILED OCT-17. 1918.

1,421, 59, Patented July 4,1922.

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A TTORNEYSZ UNITED STATES PATENT OFFICE.

JOHN D. THOMPSON, OF ROCHESTER, NEW YORK.

PRINTING FRAME.

7 Specification of Letters Patent.

Patented July 4, 1922.

Application filed October 17, 1918. Serial No. 258,659

To all whom it may concern:

Beit known that I, JOHN D. THOMPSON,

a subject of the King of Great Britain, re-

siding at Rochester, in the county of Monroe and State of New York, have invented cer t ain new and useful Improvements in Printing Frames, of which the following is a full, clear, and exact specification.

This invention relates to improvements in photographic printing frames and consists in certain novel structural features which render such frames more easily operated. The frame described, while capable of other uses, is particularly intended for use in holding a half-tone negative and a sensitized metal plate in contact during exposure. These frames are usually made in rather large sizes and of several elements that require separate manipulation. One advantage of my improved frame is that by a single movement with one hand the operator can either unlock and open or close Fig. 4 is a section taken on lines 4-4 of,

Fig. 1;

Fig. 5 is a section, taken on lines 5-5 of Fig. 2. I

The device comprises a rectangular frame" 1, to which is hinged a back2, carrying a sliding pressure member 3, and a pivoted latch member 4.

The frame 1 is rectangular and encloses a space 5. The inner walls of the frame have abutments 6 forming supports for the negative or other glass 7 Apertures 8 are provided in the walls of the frame just above the abutments 6 so that when the pressure member 3 is forced into the space 5, the air may easily escape therefrom. On the front of the frame are mounted two supports, each of which comprises two parts, 10 and 11, with interengaging teeth 12, and held in place by a. screw 13. The parts 10 have their upper edges rolled over to form hinged bearing 14 for the loops 15. The loops 15 carry rollers 37. Similar supports 9 are mounted on the rear for the hinges .of the back. It is thus apparent that the parts are so adjustably connected that the pressure can be varied when the frame is used. The back 2 consists of two side bars 16 and 17 and a central bar 18, these being connected by crosspieces l9 and 20. Upon the rear ends of bars 16 and 17 are attached side pieces 21 which carry pintles 22 pivotally engaging extensions 23 from supports 9. The upper ends of these extensions carry abutments 2a to limit the swinging movement of the back. Upon the front ends of bars 16 and 17 are side pieces 25, upon which are mounted by means of pintles 26 the pivoted latch member 4-. This consists of two latches 27, connected by a single operating handle 28. I

The pressure member 3 consists of a plate 29 of a size to fit within the space 5, and

carrying on its upper surface blocks 30 and smaller spacing bars 31, the blocks 30 being connected by crosspieces 82. When assembled, the central bar 18of the back lies within the space bounded by the spacing bars 31,

crosspieces 32 and plate 29, and the pres sure member is thus slidably connected to the back. p

In the front ends of bars 30 are apertures 33 in which are seated coil springs 34'. bearing at one'end againstthe bottom of the apertures and, at the other against crosspiece 19,.and thus tending constantly to force the pressure member toward the rear of the back. On the bottom of plate 29 are secured pads 35. of felt or like material.

In use, the frame is opened and the negative and sensitive plate are placed in position; The back 2 is then closed by means of the handle 4:, the handle being swung around so that the hook ends 36 of the latches engage the rollers 37 on loops 15 and as the handle is then swung down into look ing position flat upon the back 2, both latches simultaneously act to draw the back and frame together, applying the pressure neces-- sary to insure close contact between negative and sensitive plate. The rollers 37 lessenthe friction with the latch hooks during this operation. They may be omitted, as shown in Fig. 4. As the back is swung down, the rear side 38 of plate 29 engages an edge 39 of the frame, as shown in Fig. 3, and further closing movement of the back pushes the pressure member forward relatively to the back so that it is automatically correctly positioned in the space 5 without binding. If the back 2 and member 3 were rigidly connected, it is obvious that as snug a fit could not be obtained, while if they were separate, it would require time and attention to place the pressure member before closing the back. All that the operator needs to do is to grasp the handle, engage the latch hooks and loops and swing the handle to locking position.

lVhen the frame is to be opened, it is also done with the single operation of one hand, the operator grasping the handle, swinging it forward to release the latches and then throwing the whole back to its open position against the abutments 24,-. As this is done With a quick jerk, the springs come into play to prevent unnecessary rattling of the sliding pressure member.

Having thus described my invention what I claim as new and desire to secure by Let ters Patent is:

1. In a photographic printing machine, a frame, a back hinged thereto along one edge, a plurality of loops on the frame along the opposite edge, a plurality of locking latches on the back and adapted to engage said loops and a common handle for actuating said latches simultaneously.

2. In a photographic printing machine, a frame, a back hinged at one edge thereto, a pressure member mounted on said back and adapted to slide thereon to and from the hinged edge thereof.

3. In a photographic printing machine, a frame, a back hinged at one edge thereto, a pressure member mounted on said back and adapted to slide thereon to and from the hinged edge thereof and means exerting a force upon said pressure member tending to move it toward the hinged edge.

4c. In a photographic printing apparatus, a frame, a back hinged thereto along one edge and carrying a pressure member which is adapted to fit within the frame when the back is swung over the frame, and a plurality of interacting devices on the back and frame along the other edge and means for simultaneously actuating said means, to

55. In a photographic printing apparatus, i une, a back hinged thereto along one ge and carrynng a pressure member which 1 EU is adapted to lit within the frame when the back swung over the frame, and a plurali of loops along the opposite edge of the frame, a plurality of locking and tensioning latches on the back and adapted to e age said loops, and a common handle for ting said latches sin'iultaneously.

G in a photographic printing machine, a fran'ie with a recess therein, a back hinged to the frame along a line removed from the "re the recess, the back carrying on its side a pressure member adapted to slice thereon toward and from the hinge line, so that when the back is closed over the frame the edge the pressure member will engage the edge of the recess and be simultaneously forced into the recess and along the away from the hinge line.

'4. In a photographic printing machine, a frame with a recess, therein, a back hinged to the frame along a line removed from the or go of the recess, the back carrying on its under side a pressure member adapted to slide [hereon toward and from the hinge line, means exerting a force upon said pressure member tending to move it toward the hinge line, so that, when the back is closed over the frame, the edge of the. pressure member will engage the edge of the recess and be simultaneously forced into the recess and along the back away from the hinge line and, when the back is raised, the pressure member will be forced toward the hinge line.

8. in a photographic printing machine, a trains with a recess therein, a back hinged to the frame, a pressure member slidably mounted on the back and adapted to move to and from the hinged edge thereof, spring means tending to move said pressure member toward the hinged edge, plurality of enacting pressure exerting and locking means on the back and frame and a common actuating means for said last named means.

Signed at Rochester, New York, this 14th day of October 1918.

JOHN D. THOMPSON. 

